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onde<br />

137<br />

Consideremos agora os dois integraes duplos<br />

O primeiro dá<br />

f/í , f2* J»K ,n /*2* ,0/7í J 8 »'' ,<br />

/. "% ça*/. "j. *»*<br />

/><br />

F — arc tang -<br />

on, por terem P, Q, - e ^ os mesmos valores quando è<br />

G — 0 e 0 - 2«,<br />

Do mesmo modo se acha<br />

«<br />

f0 ?p ?0<br />

/<strong>•</strong>2« r/î32F f^Uvl 11 /* 2lt tf íõ"'JO ,n<br />

que, por ser<br />

quando é p = 0, e<br />

V 30 30<br />

/* -|- Q* r\ /

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